Vanadium isotope composition of seawater

Wu, Fei; Owens, Jeremy D.; Huang, Tian-Yi; Sarafian, Adam R.; Huang, Kuo‐Fang; Sen, Indra Sekhar; Horner, Tristan J.; Blusztajn, J.; Morton, Peter L.; Nielsen, Sune G.

doi:10.1016/j.gca.2018.10.010

Cited by 34 publications

(21 citation statements)

References 57 publications

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“…Among them, the δ( 51 V) values of JDo-1 (Permian dolostone) and JLs-1 (Triassic limestone) are close to those of the upper continental crust and riverine input (∼−0.6‰) 16,35 and significantly lower than those of modern seawater (∼0.2‰). 14,16 However, this does not require abandonment of the application of carbonate-hosted δ( 51 V) as a paleo-redox proxy, since a local or global redox change, isotope fractionation during V coprecipitation with carbonates, contaminations from other mineral phases, and carbonate diageneses can potentially alter δ( 51 V) values in carbonates. In future studies, our method for carbonate-hosted δ( 51 V) measurements could help to investigate (1) V isotope fractionation during V coprecipitation with carbonates or between seawater and marine carbonates, (2) V isotope distributions between different mineral phases in marine carbonates, and (3) the behavior of V isotopes during carbonate diageneses.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Oceanic V burials into sediments under different redox conditions are accompanied by a large range of magnitudes of V isotope fractionation: ∼−1.1‰ into oxic sediments, ∼−0.7‰ into anoxic sediments, and ∼−0.4‰ into euxinic sediments. [12][13][14]23,24 Therefore, the δ( 51 V) value of seawater is controlled by the balance between major sinks in the oceanic V cycle and consequently by global marine redox states.…”

mentioning

confidence: 99%

“…Recently, sedimentary V isotope signatures have been advocated as a novel paleo-redox proxy. − Vanadium has two isotopes, 50 V (0.24%) and 51 V (99.76%) (Table S1). , Vanadium isotope compositions are generally reported in the δ notation (in per mil) relative to an Alfa Aesar (AA) standard solution (eq ): , …”

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confidence: 99%

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Determination of Vanadium Isotope Compositions in Carbonates Using an Fe Coprecipitation Method and MC-ICP-MS

Dong

Wei

et al. 2021

Anal. Chem.

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Vanadium isotope compositions (δ(51V)) in marine carbonates are a potential proxy to trace global redox states of ancient oceans. Although high-precision δ(51V) analyses are available for many geological materials, carbonate-hosted δ(51V) data have not been reported yet due to extremely high matrix elements and low V contents (generally below 10 μg g–1). In this study, we developed an Fe coprecipitation method combined with an Fe column to preconcentrate V from the major matrix elements and subsequent four-step chromatographic procedures to further purify V in carbonates. The δ(51V) values were measured using a sample–standard bracketing method by MC-ICP-MS. The robustness of this method was assessed by analyzing element-doped and matrix-spiked synthetic carbonate solutions containing an in-house δ(51V) standard, USTC-V. The mean δ(51V) value of the synthetic carbonate solutions (0.06 ± 0.08‰; 2SD, n = 33) is in good agreement with the recommended value of the USTC-V relative to the Oxford AA solution (0.07 ± 0.08‰; 2SD, n = 347). In addition, the consistency in the δ(51V) value of the igneous carbonatite standard, COQ-1, which was processed in parallel with the whole purification (−0.48 ± 0.04‰; 2SD, n = 3) and a four-step chromatographic procedure (−0.43 ± 0.08‰; 2SD, n = 3), further validates the robustness of our method. For the first time, we obtained δ(51V) values of four carbonate reference materials: JDo-1, −0.56 ± 0.09‰ (2SD, n = 27); JLs-1, −0.61 ± 0.14‰ (2SD, n = 33); GBW07217a, −0.79 ± 0.09‰ (2SD, n = 6); GBW07214a, −0.51 ± 0.13‰ (2SD, n = 48). The long-term external precision of carbonate-hosted δ(51V) analyses is better than ±0.14‰ (2SD). Our method can be applied to measure carbonate-hosted δ(51V) to trace the evolution in global marine redox states throughout the Earth’s history.

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Section: ■ Results and Discussionmentioning

confidence: 99%

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confidence: 99%

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Determination of Vanadium Isotope Compositions in Carbonates Using an Fe Coprecipitation Method and MC-ICP-MS

Dong

Wei

et al. 2021

Anal. Chem.

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“…Reinhard et al, 2013) will enable more accurate estimates for changes in global oceanic redox conditions before, during, and after LIP events. New redox-sensitive metal isotope systems, such as Cr (Holmden et al, 2016;Wang et al, 2016b), V (Wu et al, 2019), and Re (Miller et al, 2015), may provide additional constraints. Organicrich mudrocks host authigenic enrichments of many redox-sensitive metals, making this sedimentary archive particularly attractive for building large multi-isotope data sets.…”

Section: Discussionmentioning

confidence: 99%

Assessing the Effect of Large Igneous Provinces on Global Oceanic Redox Conditions Using Non‐traditional Metal Isotopes (Molybdenum, Uranium, Thallium)

Kendall

Andersen

Owens

2021

Large Igneous Provinces

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During the past two decades, the isotope ratios of numerous redox-sensitive metals in sedimentary archives (particularly organic-rich mudrocks, carbonates, and iron formations) have emerged as valuable tools for constraining changes in global oceanic redox conditions. The long modern ocean residence times of Mo (~440 kyr; Miller et al., 2011), U (~450 kyr; Dunk et al., 2002), and Tl (~20 kyr;Nielsen et al., 2017) relative to ocean mixing times (~1-2 kyr; Sarmiento & Gruber, 2006), together with the distinctive isotope fractionations observed for metal removal into diverse marine sinks, means that the isotopic composition of these metals can serve as global oceanic redox tracers. Redox-sensitive metal isotopes have become an attractive tool with which to place constraints on the magnitude of oceanic anoxia associated with the emplacement of LIPs. The overarching approach is to use sedimentary rocks (organic-rich mudrocks for Mo, U, and Tl; carbonates for U) to infer the isotopic composition of coeval global seawater before, during, and after LIP emplacement, and employ isotopic mass

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“…Isotope compositions were determined using standard sample bracketing with the Alfa Aesar reference solution that is defined as  51 V = 0‰ (92). Each unknown sample was interspersed with a pure V reference solution from BDH Chemicals that has now been measured in nine separate studies with the indistinguishable  51 V = −1.18 ± 0.02‰ (2SE) (21,34,48,(92)(93)(94)(95)(96)(97). The mass spectrometer was operated in medium resolution mode.…”

Section: Methodsmentioning

confidence: 99%

Fossil records of early solar irradiation and cosmolocation of the CAI factory: A reappraisal

et al. 2021

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Calcium-aluminum-rich inclusions (CAIs) in meteorites carry crucial information about the environmental conditions of the nascent Solar System prior to planet formation. Based on models of 50V-10 Be co-production by in-situ irradiation, CAIs are considered to have formed within ~0.1 AU from the proto-Sun. Here, we present vanadium (V) and strontium (Sr) isotopic co-variations in fine-and coarse-grained CAIs and demonstrate that kinetic isotope effects during partial condensation and evaporation best explain V isotope anomalies previously attributed to solar particle irradiation. We also report initial excesses of 10 Be and argue that CV CAIs possess essentially a homogeneous level of 10 Be, inherited during their formation. Based on numerical modeling of 50V-10 Be co-production by irradiation, we show that CAI formation during protoplanetary disk build-up likely occurred at greater heliocentric distances than previously considered, up to planet-forming regions (~1AU), where solar particle fluxes were sufficiently low to avoid substantial in-situ irradiation of CAIs.

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Vanadium isotope composition of seawater

Cited by 34 publications

References 57 publications

Determination of Vanadium Isotope Compositions in Carbonates Using an Fe Coprecipitation Method and MC-ICP-MS

Determination of Vanadium Isotope Compositions in Carbonates Using an Fe Coprecipitation Method and MC-ICP-MS

Assessing the Effect of Large Igneous Provinces on Global Oceanic Redox Conditions Using Non‐traditional Metal Isotopes (Molybdenum, Uranium, Thallium)

Fossil records of early solar irradiation and cosmolocation of the CAI factory: A reappraisal

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